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Certificate validity checking

a certificate and validity technology, applied in the field of certificate validity checking, can solve the problems of unauthorized terminal devices being inserted into the local network, failing to obtain public keys, and affecting the validity of certificates, etc., and achieving the effect of preventing the certificate from being disabled sooner

Inactive Publication Date: 2007-08-09
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method and system for checking the validity of a certificate associated with a network device in a network. The certificate contains a key and a validity index associated with the key. The validity index contains a time index that indicates the time of issue of the certificate. The method involves evaluating the validity of the certificate based on the time index and the validity index. The validity index can be received in encrypted form and decrypted at the network. The system includes a content receiver that receives an encrypted content and a validity index associated with the content. The validity index can be received in encrypted form and decrypted at the network. The system also includes decrypting means to decrypt the validity index. The invention allows for secure and efficient checking of the validity of certificates in a network.

Problems solved by technology

However, a hacker could perhaps succeed in obtaining the public key and insert unauthorized terminal devices into the local network.
However, if a hacker succeeds in accessing a protected content, the certificate may be disabled sooner than expected: a new CRL is generated, the new CRL comprising an identifier of the disabled certificate.

Method used

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Examples

Experimental program
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first embodiment

[0093]FIG. 7 illustrates an example of a method for checking a validity of a certificate according to the present invention. The certificate is associated to a network device in a network.

[0094] An encrypted content is received at the network. An encrypted validity index associated to the encrypted content is received at the network (box 71). The received validity index is decrypted at decrypting means of the network (box 72).

[0095] Alternatively, the validity index VI is integrity protected such that a hacker cannot alter a value of the validity index VI without visible consequences. For example, an index signature is associated to the validity index, the index signature having a value that is computed from a value of the validity index and from a secret key stored at a secure device of the network. The secure device, e.g. a content receiver, comprises checking means, e.g. a portable security module, allowing to check an integrity of the validity index from the index signature. Th...

second embodiment

[0100]FIG. 8 illustrates an example of a method for checking a validity of a certificate according to the present invention.

[0101] The certificate comprises a time index TI that has a value corresponding to a time of issue of the certificate, e.g. a date of a manufacturing of a hardware support of the certificate. The time index TI is read (box 81).

[0102] A validity interval I is derived from the read value of the time index TI (box 82).

[0103] The time index TI may be contained in an encrypted form within the certificate. In this latter case (not represented), the time index TI is decrypted before the deriving of the validity interval I.

[0104] When an encrypted content and an associated validity index VI are received at the network (box 83), the validity of the certificate is evaluated: the certificate is evaluated as valid if the received validity index VI belongs to the time interval I (box 86). If the received validity index VI is outside the time interval I, the certificate i...

third embodiment

[0108]FIG. 9 illustrates an example of a method for checking a validity of a certificate according to the present invention. The certificate is associated to a network device of a network.

[0109] An encrypted content and an associated validity index VI are received at a network (box 91). The received validity index is used to update a comparison index CI (box 92). The comparison index is stored within a determined network device of the network, e.g. the network device to which the certificate is associated.

[0110] The updated comparison index is compared to a time index TI contained within the certificate (box 93). The time index has a value that corresponds to a time of issue of the certificate. The validity of the certificate is thus evaluated from the time index TI and from the validity index VI, the validity index VI only allowing to update a comparison index CI.

[0111] The certificate is evaluated as invalid if the time index TI is smaller than the updated comparison index (box ...

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Abstract

A method for checking a validity of a certificate containing a key associated to a network device in a network, comprises receiving at the network an encrypted content and a validity index associated to the content. The validity of the certificate is evaluated from a time index contained within the certificate, the time index having a value corresponding to a time of issue of the certificate, and from the validity index associated to the encrypted content.

Description

BACKGROUND OF INVENTION [0001] 1. Field of the Invention [0002] The invention relates generally to the field of secure communication networks. [0003] 2. Background Art [0004] Data exchanged through a network may be copied. Hardware manufacturers hence need to protect the exchanged data and to manage permissions or prohibitions to copy the data. Typically, a Public Key Infrastructure (PKI) is provided: a trusted third party, e.g. a certifying authority, generates private / public keys pairs. The private / public keys pairs are involved in data exchanges between network devices of the network. [0005] The trusted third party signs certificates that contain the public key of the private / public keys pair. Typically, each network device of the network is associated to a determined certificate. The determined certificate may for example be stored within a portable security module of the associated network device. The certificates allow to insure that the data is exchanged between network devic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L9/00G06F21/00H04N7/167
CPCH04L63/045H04L63/065H04L63/0823H04L2209/60H04N21/26606H04N21/4405H04L9/3268H04L2463/062H04L9/30H04N21/25G06F1/00H04N21/2347
Inventor DURAND, ALAIN
Owner THOMSON LICENSING SA
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